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Transcriptome Analysis Revealed Hormone Pathways and bZIP Genes Responsive to Decapitation in Sunflower
Lili Dong1, Yu Wu1, Jianbin Zhang1
1College of Horticulture, Anhui Agricultural University, Changjiang West Road, Shushan District, Hefei 230036, China.
Genes
|October 27, 2022
Summary
Decapitation in sunflowers triggers lateral bud growth by altering plant hormones like auxin and cytokinin. Specific HabZIP genes likely interact with these hormonal changes to control bud development.
Area of Science:
- Plant biology
- Agricultural science
- Molecular genetics
Background:
- Decapitation is a key agricultural practice and research method for studying shoot branching.
- The precise molecular mechanisms by which decapitation regulates plant branching remain largely unknown.
Purpose of the Study:
- To investigate the role of hormonal changes and specific genes in decapitation-induced bud outgrowth in sunflowers.
- To identify and characterize members of the HabZIP gene family in sunflowers and assess their potential involvement in branching control.
Main Methods:
- Sunflower decapitation experiment with subsequent analysis of hormone levels (IAA, ABA, CK).
- Phylogenetic analysis, conservative domain analysis, intron/exon structure, and motif composition investigation of the HabZIP gene family.
- Transcriptome analysis, including tissue-specific and decapitation-induced expression profiling of HabZIP genes.
Main Results:
- Decapitation led to lateral bud development, decreased indole-3-acetic acid (IAA) and abscisic acid (ABA) levels, and increased cytokinin (CK) levels.
- Identified and classified 82 sunflower HabZIP family members into 9 distinct groups.
- Several HabZIP genes showed expression patterns suggesting a role in regulating decapitation-induced bud outgrowth.
Conclusions:
- Hormonal dynamics, specifically changes in IAA, ABA, and CK, are crucial for decapitation-induced axillary bud development in sunflowers.
- Specific HabZIP genes, in conjunction with these hormonal shifts, are hypothesized to play a significant role in controlling bud outgrowth following decapitation.
